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Condensed Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash Flows from Operating Activities:    
Net income (loss) $ 1,510,602 $ (2,308,059)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
(Increase) decrease in commodity futures trading account - cash and cash equivalents (16,299,361) 2,072,571
Unrealized (gain) loss on futures contracts (1,670,430) 547,240
Decrease in receivable from General Partner 22,948 17,729
Decrease in dividend receivable 427 453
Increase in other assets (1,552) (1,856)
Decrease in professional fees payable (58,630) (63,335)
Increase (decrease) in General Partner management fees payable 12,366 (2,138)
Increase in brokerage commissions payable 465 10
Increase in other liabilities 489 215
Net cash provided by (used in) operating activities (16,482,676) 262,830
Cash Flows from Financing Activities:    
Addition of partnership shares 41,667,775 41,878,777
Redemption of partnership shares (17,231,840) (45,759,062)
Net cash provided by (used in) financing activities 24,435,935 (3,880,285)
Net Increase (Decrease) in Cash and Cash Equivalents 7,953,259 (3,617,455)
Cash and Cash Equivalents, beginning of period 25,257,312 39,506,019
Cash and Cash Equivalents, end of period $ 33,210,571 $ 35,888,564